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L
Low C (Soft Margin): The SVM prioritizes maximizing the overall margin width. It is "soft" because it tolerates some points being on the wrong side of the margin or even misclassified. Reduces overfitting.
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H
High C (Hard Margin): The SVM strictly penalizes misclassifications. It will create a narrow margin just to correctly classify every training point perfectly. Can lead to overfitting on noisy data.